KitchenAid Oven F31 Error: Steam Generator Sensor Fault
What Does KitchenAid Oven Error Code F31 Mean? Error code F31 on a KitchenAid steam wall oven (KOSC series) indicates that the steam generator temperature or water-presence sensor is reading outside its expected range. The control board monitors this sensor continuously during steam operation to confirm the generator is heating safely and efficiently. When the […]
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Yes. Conventional bake, broil, and convection modes are unaffected and safe to use while F31 is active. Only steam and steam-combination functions are blocked until the steam generator sensor is serviced.
Can I reset the code?
Yes. A successful descaling cycle may clear F31 if scale buildup was the cause. If the sensor or generator element has physically failed, the fault returns immediately after any reset and service is required.
When to stop immediately?
Stop if you notice: Water leaks from the oven bottom during or after a steam cycle attempt, F31 persists after a completed descaling cycle.
Symptoms You May Notice
Steam oven begins a steam cycle then stops and displays F31 within the first three minutes
The steam generator heats briefly but the control board cannot confirm correct generator operation from the sensor signal, so it aborts the cycle early and locks out all steam modes.
Oven completes a full preheat in bake mode but generates no steam when a steam injection is requested
On combination steam-convection models the convection portion completes normally, but steam injection never occurs because the steam generator sensor fault has disabled the steam circuit.
Water remains in the tank after multiple steam cycles but steam output has diminished progressively over time
The steam generator is producing less and less steam per cycle as scale buildup on the sensor element causes increasingly inaccurate readings before triggering F31 on failure.
Possible Causes
Mineral scale buildup on the steam generator sensor
Hard water deposits coating the temperature or NTC sensor inside the steam generator cause its resistance to drift outside the expected range, triggering the fault.
DIY PossibleFailed steam generator NTC or thermostat sensor
The sensor component inside the steam generator has failed open or short, providing an out-of-range signal that the control board cannot interpret as a valid generator state.
Requires ProfessionalSteam generator heating element failure
The heating element inside the steam generator has partially failed, causing it to heat inconsistently and driving the sensor reading outside the expected normal operating window.
Requires ProfessionalSafe Checks You Can Do
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1
Run the steam oven descaling cycle if available
Check the KOSC owner's manual for a descaling or self-clean cycle for the steam generator. Many KitchenAid steam models have a built-in descale program accessible from the settings menu. Running it with a citric acid solution clears mineral deposits from the sensor and generator.
Use only the descaling agent and concentration specified in the KitchenAid KOSC owner's manual — incorrect concentrations can damage the generator lining.
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2
Inspect the tank and water for unusual color or mineral deposits
Remove the water tank and look for heavy mineral scale, discoloration, or floating particles that would indicate severe water hardness contributing to generator fouling.
Switching to filtered water after descaling significantly extends the interval between F31 fault occurrences.
When to Call a Professional
Contact a qualified technician if:
- Descaling does not resolve F31 — NTC sensor or heating element has failed
- Steam generator disassembly required to replace the sensor — not a homeowner task
- Steam generator heating element failure requires full generator replacement on most KOSC models
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